Definitions
from The Century Dictionary.
- noun   Same as 
cyclopentane . 
from the GNU version of the Collaborative International Dictionary of English.
- noun (Chem.)  A hypothetical hydrocarbon, C5H10, metameric with the amylenes, and the nucleus of a large number of derivatives; -- so named because regarded as composed of five methylene residues. Cf. 
trimethylene , andtetramethylene . 
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun organic chemistry  A 
hypothetical hydrocarbon , C5H10,metameric with theamylenes , and thenucleus of a large number ofderivatives . 
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
penta- + methylene, being composed of five methylene residues.
			
		
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